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3 years ago

Which statement explains the similarity between momentum and kinetic energy of an object?

Physics

1 answer:

Nata [24]3 years ago

7 0

Answer:

B. Both are directly proportional to the mass and velocity of the object.

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A very small source of light that radiates uniformly in all directions produces an electric field amplitude of 8.45 V/m at a poi

Mandarinka [93]

Answer:

4.43 kW

Explanation:

Since Intensity I = P/A = E²/2cμ₀ where P = Power, A = Area = 4πr² where r = distance from source = 61 m and E = electric field amplitude = 8.45 V/m.

P = E²A/2cμ₀ = E²4πr²/2cμ₀ = 2πE²r²/cμ₀

= 2π(8.45 V/m)²(61 m)²/3 × 10⁸ m/s × 4π × 10⁻⁷ Tm/A

= 4428.1 W

= 4.4281 kW ≅ 4.43 kW

6 0

3 years ago

A 1000 kg train car traveling at 12 m/s on a level track has 400 kg of sand dumped, vertically, into it. What is the final speed

crimeas [40]

Answer:

The final speed of the train car is 8.57 m/s.

Explanation:

Given that,

Mass of train car = 1000 kg

Mass of sand = 400 kg

Speed of train car = 12 m/s

We need to calculate the final speed of the train car after the sand is dumped

Using conservation of momentum

$m_{1}u_{1}=(m_{1}+m_{2})v$ ...(I)

Put the value in the equation (I)

$1000\times12=(1000+400)v$

$v=\dfrac{1000\times12}{1400}$

$v=8.57\ m/s$

Hence, The final speed of the train car is 8.57 m/s.

5 0

3 years ago

A 10.0-kg box is pulled by a horizontal wire in a circle on a rough horizontal surface for which the coefficient of kinetic fric

QveST [7]

Answer:

a) $W_{f}=307.87 J$

b) $W_{f}=615.752 J$

c) Therefore it is a nonconservative force

Explanation:

Distance traveled in one complete circular trip against friction

$d=2\pi *r$

The force of friction is

$F_{f}=u*F_{N}$

$F_{N}=w*g$

The work of friction is the force of friction in the distance so

$W_{f}=-F_{f}*d$

a).

$F_{N}=10kg*9.8\frac{m}{s^2}$

$F_{N}=98N$

$F_{f}=0.250*98N$

$F_{f}=24.5N$

$W_{f}=-24.5N*2\pi*2m$

$W_{f}=307.87 J$

b).

$W_{f}=-24.5N*2\pi*4m$

$W_{f}=615.752 J$

c).

Since the circle returns to its initial position in both cases and the work done by the friction force different in both cases, so the friction force does depend on the path;

3 0

3 years ago

Match the descriptions with the graphs !

noname [10]

Answer:

Graph 1 matches with B, 2 with A, and 3 with C.

Explanation:

Graph 2 shows a car whose distance part of the graph is not going up or down, while the time going up. That means that the car is stopped. Graph 1 shows a straight line, meaning that the car is traveling at a constant speed. Graph 3 is a curved line, meaning the speed of the car is changing somehow, and since the line is becoming more horizontal, the car is getting slower.

8 0

3 years ago

An old clock has a spring that must be wound to make the clock hands move. Which statement describes the energy of the spring an

topjm [15]

Answer:

Explanation:

neither the spring or hands are in the action of movemnet

8 0

3 years ago